. SAFETY GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTENANCE gas is removed and that ample fresh air is brought in. 2 - 18 PRECAUTIONS WHEN RUNNING ENGINE INSIDE BUILDING The your place engine health wher exhaus or even e there t gas caus is goo contains substances that may damage e death. Start or operate the engine in a d ventilation. If the engine or machine must be operated i ventilation is poor, nside take s a building or u teps to ensure nder that